Series connection of quantum Hall resistance array and programmable Josephson voltage standard for current generation at one microampere
Series connection of quantum Hall resistance array and programmable Josephson voltage standard for current generation at one microampere
复制标题
量子霍尔电阻阵列和可编程约瑟夫森电压标准的串联，用于产生 1 微安电流
DOI：
10.1088/1681-7575/ac97a0
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发表时间：
2022
期刊：
影响因子：
2.4
通讯作者：
Kaneko Nobu-Hisa
中科院分区：
文献类型：
--
作者：
Chae Dong-Hun;Kim Mun-Seog;Oe Takehiko;Kaneko Nobu-Hisa
在欧姆定律的框架下，将恒定电压和零互连电阻串联起来，可以实现精确电流。然而，在实践中，精确的电流实现受到所用电阻、固态电压源和互连导线对环境波动（如温度或大气压）的时间漂移和不稳定性的限制。在这里，我们产生了一个1 μA的电流，由约瑟夫森电压和量子化霍尔电阻阵列（QHRA）决定。可编程约瑟夫森电压标准（PJVS）、1 MΩ QHRA和超稳定低噪声电流放大器（ULCA）串联，可产生和测量1 μA的电流。预期电流计算为约瑟夫森电压与QHRA的比值加上PJVS的输出电阻。ULCA测量电流与计算电流的相对差值小于40 nA A−1，综合测量不确定度（k= 1）为0.13 μA A−1。
An accurate current can be realized by a series connection of an invariant voltage and resistance with zero interconnection resistance in the framework of Ohm's law. In practice, however, accurate current realization is limited by the temporal drift and instability of employed resistors, solid-state voltage sources and interconnection wires against environmental fluctuations, such as temperature or atmospheric pressure. Here, we generated a current of 1 μA, determined by the Josephson voltage and quantized Hall resistance array (QHRA). A programmable Josephson voltage standard (PJVS), 1 MΩ QHRA and ultrastable low noise current amplifier (ULCA) are connected in series to generate and measure a current of 1 μA. The expected current is calculated as the ratio of the Josephson voltage to the QHRA plus the output resistance of the PJVS. The relative difference between the current measured by the ULCA and the calculated current is as small as 40 nA A− 1 with a combined measurement uncertainty (k= 1) of 0.13 μA A− 1.